Threat Intelligence Database

CVE-2026-84942 is a high-severity cross-site scripting (XSS) vulnerability in AWS Amazon OpenSearch Service affecting the Vega expression function in OpenSearch Dashboards. It allows a remote authenticated user with dashboard write permissions to execute arbitrary JavaScript in other users' browsers by saving a crafted Vega visualization. The vulnerability is due to improper input validation that fails to inspect nested arrays, enabling malicious function properties to bypass checks. This can lead to full compromise of user sessions without affecting service availability. A patch is available, and AWS manages remediation for this cloud service.

CVE-2026-77811 is a stored cross-site scripting (XSS) vulnerability in the dashboards-observability plugin of OpenSearch Dashboards. It allows a remote authenticated user with write permissions to upload a custom integration containing arbitrary JavaScript. When other users access the affected static file endpoint, the malicious script executes in their browser, potentially performing actions on their behalf with their privileges. This affects self-managed OpenSearch Dashboards versions before 3.4 and 2.19.6, and Amazon OpenSearch Service versions before 3.3. The issue has been fixed in OpenSearch Dashboards versions 3.4 and 2.19.6 and all affected Amazon OpenSearch Service versions via service software updates. Users are advised to upgrade to these fixed versions or apply the managed service update. Workarounds include restricting write access and avoiding direct access to the vulnerable endpoint.

CVE-2026-75897 is a high-severity vulnerability in OpenSearch Dashboards affecting versions 1.3.0 through 3.7.0 inclusive. It involves improper input validation in the capabilities route handler, which does not limit the size of request payloads. This flaw can be exploited remotely to cause a denial of service (DoS) by sending crafted HTTP requests. The issue is inherited from upstream Kibana versions 7.7.1 through 7.10.2. AWS has released patched service software updates for Amazon OpenSearch Service to address this vulnerability.